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The group 9SpSpspsp is used to give supplementary information on _____. Although the codes provide for such reporting, unless special instructions are received from the ADM, only two 9-groups shall be used: ____.
special phenomena, 909Rtdc and 931ss
The 909Rtdc shall be used to indicate the ______ and ______
time at which precipitation began or ended, duration and character of precipitation
The 909Rtdc shall be reported whenever group _____ is encoded and the _____ of this group is not encoded as 000
6RRRtR, 000
The 931ss group shall be used to indicate ______ and:
The measurement is reported in ____, up to 55 cm
Measurements above 55 cm shall be encoded in accordance with Table 15-31
The group shall be included at the discretion of the RDG, but only by stations that take 4 staffed synoptic observations daily and when the rounded measurement is 1 or more
depth of new fallen snow
whole centimetres
What figure indicates that the group 9SpSpspsp included in the report?
9
When selecting the Rt code and there is a choice, use _____.
the smaller code figure
When there are 2 or more time periods of precipitation, always use the _____.
last period
When you have coded ww = 50-98, use the time ____.
at which precipitation began
When you have coded ww = 20-27 and 20, this implies precipitation was in the last hour; therefore use the time ____.
when the last period began
For all ww codes other than 20-27, 29, and 50-98, use the time ____.
that the precipitation ended
The symbol Rt indicates the time at which precipitation given by _____ began or ended. It shall be coded with reference to _____.
RRR, the official time of observation
Code the following Rt
Precipitation Type: -RA
Start: 0817
Stop:
9094
Code the following Rt:
Precipitation Type: -RA
Start: 0817
Stop: 1133
9094
Code the following Rt:
Precipitation Type: -RA
Start: 0817
Stop: 1028
9092
Code the following Rt:
Precipitation Type: -SHRA
Start: 0612
Stop: 0639
Precipitation Type: -SHRA
Start: 0816
Stop: 0845
9092
Code the following Rt:
Precipitation Type: -SHRA
Start: 0542
Stop: 0639
Precipitation Type: -SHRA
Start: 1016
Stop:
9092
Code the following Rt:
Precipitation Type: -SN
Start: 0628
Stop: 1139
Precipitation Type: DRSN
Start: 0812
Stop:
9091
The symbol dc indicates the ____ of precipitation given by RRR.
Occurrences of precipitation shall be considered as separate periods of precipitation when separated by intervals of _____.
duration and character, 15 minutes or more
If only one period of precipitation has occurred during the past 6 hours, which dc codes apply?
0-3
If two or more periods of precipitation have occurred during the past 6 hours, which dc codes apply?
4-7
Code the following Rtdc
Precipitation Type: -RA
Start: 0817
Stop:
90942
Code the following Rtdc:
Precipitation Type: -RA
Start: 0817
Stop: 1133
90942
Code the following Rtdc:
Precipitation Type: -RA
Start: 0817
Stop: 1028
90920
Code the following Rtdc:
Light rain began at 0211Z on the previous day
Precipitation Type: -RA
Start: →
Stop: 0639
Precipitation Type: -RA
Start: 1016
90927
Code the following Rtdc:
Precipitation Type: -SN
Start: 0628
Stop: 1139
Precipitation Type: DRSN
Start: 0812
Stop:
90912